<p>why do u need a prep book for math…</p>
<p>that test was so easy i had 20 min to spare after i spent 10 min deriving the double angle identity for sine on the last question. (sin2x=2sinxcosx)</p>
<p>why do u need a prep book for math…</p>
<p>that test was so easy i had 20 min to spare after i spent 10 min deriving the double angle identity for sine on the last question. (sin2x=2sinxcosx)</p>